Iron manufacture.



,char'ged pr or to chargigg .umrnn g nonnnr nficnnn mn, .12., or mrnnnn'rown, onto, nssrenon ro THE rnmmilkte- 'rI'o'NAL METAL PRonuo'rs oom'rnmr, on \NEW mmy,

. 3 monirnnunnorunn. H r

940,784. specificatio iof l'ietters latentwj xPatGlI-tBQNOVQ23, 1909; no Drawing. is, 1909; Samari -50m n yinplication file l fluly To all who inmag concern? Be it knownfhat LR BERT B. CARNeHAN, In, a:cit izen of the United States,residmgat I I Middletown, Butler county, Ohio, have in- 5 vented certain new and useful Improvements is a specificatiom For. the usual pnddling and knobbling processes for the p'rdduction of iron having certain qualities, ,the present invention. substitutes a" process by tfieating' molten 'iron whereby there is obtained an iron combining rin h' hdegreea number-of desired ualities *not eretofore 4151 product.

' inflIron Manufacture, of which the. following" .methodpf productionpossesses.anextraordinary; high degree of malleability, it rolls .20 galvanizes'in a very superior-manner, it res sts corroslon to a superiorextent, t ylelds a particularly .smooth' surface under the.

" faction of rolls, and itzworks readily at such low heats as to avoid the scalingpfsurfaceq therefrom.

" .hemh furnace'with pig-iron orcas't iron or -inolten' iron. In practicethere" has beensub 35.1

s'tituted low carbon iron-or steelscrap. to'aa considerableextent, in some. cases as high as 1 I eighty per cent.of the charge. Lime or fstiene' is to be lcharged tb rleduceisulfpnaled 0s orus' it ese agents ein re era p p the m e tal. Th as in making soft steelyby the 'employmentflo ffore or agita tion,-o1,hoth, but,-unlikethe steel process, ref carburization at this stage is. not necessary .45' h1'case the charge melts specially low-in .charge'is then to .be're'fin carbon'. The refining operation is -then. to be carried forward with ascending-temperfin g being. prolonged and-at sh h h gh heat l 50 (from one to four-hours more-time thanis A employed -found.- in any sing'e iron v I J h metal resulting from the impr d into sheets remarkably free from blisters, it?

'two 7 rolling mill or bloom'e'ry ingots or 'de f. "foundry castln-gs or further products worked so carrying. outmy improved manufam ture- I charge a .highpowered basicbpen consisting o ture asthe carbon becomes reduced --the' reg.

in making high grade sdft steel,

and at an ultimate bath temperature of at least 2850 deg. F.), that, by bath test, the.

'bath' will con 'tain"not over percent. of sulfuryphosphorus, carbon, manganese and silicon-taken in the aggregate. For the best" results'it is desirable and practicable tore- 1 bon'normanganese over .02 per cent.

duce thisaggregate tolessthanone half the percentage'named, and to have neither car- The refined metal is to: be poured into.

molds while still at high temperature, and

while stillmolten it is to be deoxidized and product will contain not'over .05 per cent. of oxygen as determined 'by the method of .Ledebur, and preferably considerably below this,- and will contain at least 99.80 per cent.

of iron. The deox.idation and degasification may be very satisfactorily accomplished by that aluminum; pig-iron be' used, Aluminum' may beeconomized by partially. deoxidizing the bath byemploying pig-iron say to eight perscent. of the charge; The and deoxidi'zing'agents must, (of

-course, ;iiot-he fsuch as 430:168861112116 above mentioned purityoithe ultimate product.

degasified'to such extent that the resulting,

70 k the addition of aluminmn in the molten and the product is thus freak-item it.

Among the various methodsffor oxygen. determination that of 'Ledebur has. been.

. The-improved'manufacture of rolling mill and bloomerty ingots and- .foundry .castings" ingia high-powe'red'b'asic o n-hearth furnating'agents for carbon and manganese sulfur and phosphorus; refinmg the charge in 'molt'en cond1tion at"such'h1gh and creasing heat; and for such -'prolonged p that analysis by -bath test shows that the sol fur,.-phosphorus, carbon, manganeseand thef following steps :chargnace with iron ;*em'ploying't erewith elimi- 1 1 Q o 'sg con ar not over 14 per centywhefi taken in' 99.80 per cent-xii iron, substantially as set the aggregate; and pouring the hot'purified forth. m

*while'in molten state with adeoxidizing 5nd metal into molds, and treating the metal ROBERT B CAHAN J 5 degasifying agent or agents to such extent Witnesses: I "that the product will contain not ov'er .05 I ELMERR. SHIPLEY, ,per cent, of oxygen andwill contain at least M. S. 'B LDEN. 

